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    <script>
        /* 1.求1-100之间的整数的累加和 */
        var sum = 0;
        for (var i = 1; i <= 100; i++) {
            sum += i;
        }
        console.log(sum);

        /* 2.求1-100之间所有的数的平均值 */
        var sum = 0;
        var average = 0;
        for (var i = 1; i <= 100; i++) {
            sum += i
        }
        average = sum / 100;
        console.log(average);

        /* 3.求1-100之间所有偶数和奇数的和 */
        //偶数的和变量even  还有一个奇数odd
        var even = 0;
        var odd = 0;
        for (var i = 1; i <= 100; i++) {
            if (i % 2 == 0) {
                even += i;
            } else {
                odd += i;
            }
        }
        console.log(even);
        console.log(odd);

        /* 4.求1-100之间所有能被3整除的数字的和 */

        var result = 0;
        for (var i = 1; i <= 100; i++) {
            if (i % 3 == 0) {
                result += i;
            }
        }
        console.log(result);
    </script>
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